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I. N. DU BOIS.. Machine for Making Plumbers Traps.

Patented Nov. 16, I880.

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FREDERICK N. DU BOIS, OF NET/V YORK, N. Y.

MACHINE FOR MAKING PLUMBERS TRAPS.

SPECIFICATION forming part of Letters Patent No. 234,463, dated November16, 1880,

Application filed March 16, 1878.

T 0 all whom it may concern:

Be it know that I, FREDERICK N. DU 1301s, of New York, in the county ofNew York and State of New York, have invented certain new and usefulImprovements in Machines for Making Plumbers Lead Traps; and I do herebydeclare that the following is a full, clear, and exact description ofthe invention, which will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specification.

On the 21th day of August, A. D. 1875, I took out Letters Patent (No.167,076) on a machine for this purpose.

The invention which is the subject of this application relates toimprovements in the nozzle, or that part of the machine where the leadissues in forming the trap.

My said original patent contains a full description of the machine, andreference is made to it for supplying an account of parts not necessaryto be described herein further than to say that in that machine the pipeis curved by increasing or diminishing the movement of two plungers inrelation to each other, so as to cause the lead to move faster on oneside of the nozzle than the other, thereby causingit to bend and form acurved pipe.

My improvements consist, first, in causing the lead to emerge through asteel ring or die fastened at the outer orifice of the nozzle, whichdetermines the outer diameter of the pipe, and can be readily removedfor repolishing. This I have found necessary, because the lead depositsa hard substance on the surface of the mouth of the nozzle, which sooncauses it to scratch the surface of the trap into furrows, which damagesthe market value of the pipe, and would eventually destroy it. It isvery difficult to remove this deposit where the nozzle is all in onepiece, and this difficulty I obviate by making the annular die, whichcan be detached, repolished, and replaced in a few minutes.

Detachable dies have been used in lead-pipe machines; but they have beenso located that they could not be detached without taking the machine topieces. Mineis distinguished from those before known in being tappedinto the edges.

outer and exposed end of the nozzle, so that they can be convenientlyand readily removed.

In my original patent I illustrated the nozzle as divided by twopartitions, the space on 5 each side being the dischargeorifice for oneof the presses, the two streams uniting above the partitions to form thepipe. These partitions are placed on each side of the central core.

Ihave found in practice that itis exceedingly 6o difficult to keep thecore immovable in making traps where the pressure 011 each side isunequal, being alternately heavier on either side, so that the tendencyis to force the core to the side of least pressure, and so make the trapthicker on the side from which it bends.

To obviate this the second part of my invention consists in placingpartitions on the sides in the plane of the bends, intermediate betweenthe others. These partitions are short and sharpened on both their upperand lower The stream of lead separated by the partitions reunites at theorifice, but the short partitions steady the core and keep it in thecenter of the nozzle.

My invention does not consist, broadly, in the use of more than twopartitions for supporting the central core, for I know that four areshown in Gunninghamspatent, No.139,946, issued June 17,1873, but in thiscase the partitions do not extend to the part where a varying motion iscaused. 0n the contrary, the lead in passing between the partitionsmoves at a uniform velocity, it being impelled by a single plunger; nordo theythe partitions-- 8 5 extend along the central core, so as tosupport it against side pressure.

Myinvention is distinguished from all before known in the use, in amachine in which two plungers are made to force different but convergentstreams of lead, of the partitions of separation, and also auxiliarypartitions set at right angles thereto in the nozzle below the point ofconvergence of the two streams, to sustain the central core againstunequal lat- 5 eral pressure.

I am aware that in Gunninghams patent, No. 139,946, the core isrepresented as being held in position byfour partitions, which subdividethe stream of lead; but in that case there was a single stream of leaddriven by a single plunger, and consequently there was at that point noexcess of pressure on one or the other side of the core, whereas in mymachine, as the partitions O G are walls of separation of two streams oflead, independently actuated, and under constantly-shiftin g pressures,there is a great tendency to force the core to one side, which requiresthe use of the intermediate braces. In Gunninghams machine these bracesor partitions are necessarily below the sliding diaphragm, leaving theouter end of the core without any support whatever,whereas in my machinethe partitions extend nearly to the end of the core, leaving only spacesufficient for the lead to unite after passing the partitions and beforeemerging from the die.

I have also found it impossible, where the lead is forced throughuniform channels, to permit irregular movement, which would prevent thetrap from issuing and moving in the same plane, the tendency being tocurl toward one side. The means of obviating this forms the subject ofmy fourth improvement; and consists in introducing into each of the fourchannels through which the lead flows the point of a set-screw, bytightening or loosening which the resistance can be increased ordiminished in any channel, and thus the tendency to twist laterallyeounteraeted,theflow being accelerated or retarded, as required.

In the annexed drawings, making part of this specification, Figure 1 isa vertical section through the short supplementary partition. Fig. 2 isa similar section through the partitions of separation, and Fig. P is ahorizontal section.

The same letters are employed in all the figures in the designation ofidentical parts.

A is the external shell of the nozzle, and B the central core, aroundwhich the pipe is formed. 0 O are the partitions of separation, by whichthe two streams of lead are kept apart until they unite above thepartition to form the pipes by their junction as theyeinerge through theoritice around the core.

D D are the supplementary partition s, placed midway between thepartitions of separation G (J, and reduced to a featheredge above andbelow. The upper edges of all the partitions are formed in zigzag bycutting them away alternately on each side, as shown.

E is a polished ring of steel set into the end of the nozzle by ascrew-thread, and forms the exterior surface of the trap, being broughtnearest to the core. Set-screws F Fare tapped through the shell of thenozzle midway between the several partitions.

What 1 claim as my invention, and desire to secure by Letters Patent, is

1. In combination with the nozzle of aleadpipe machine, a detachablering, when said ring is arranged in the outer and exposed end of thenozzle, so as to permit its attachment and removal without thedisplacement of other parts, substantially as set forth.

2. The combination, in the nozzle of a lead trap machine in whichdistinct and independently actuated streams of lead are caused to unitenear the mouth of the nozzle, of a central core, 13, partitions O (3extending along the core to the part where the converging streams arepermitted to unite, and which serve to separate such streams, andsupplementary partitions D D intermediate between the separatingpartitions O C, and bracing the core nearly to the outer end thereof,substantially as set forth.

3. The combination, with the nozzle, central core, and partitions of alead-pipe machine, of the set-screws F, tapped through the nozzle, sothat their-joints shall enter the channel between the partitions,substantially as set forth.

In testimony that I claim the foregoing as my own I aflix my signaturein presence of two witnesses.

FREDERICK N. DU BOIS.

Witnesses F. IV. BLAUVELT, JAMES J. CAMPBELL.

